Book Maths Puzzle Numerical Ability Pipes and Cistern

a cistern has a leak whick would empty in 8 hours. a tap is turned on, which fill the empty cistern 6 litres a minute. and the cistern is now empetied in 12 hours.the cistern can hold??

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Book Other Question

Suppose you enter an elevator at a certain floor. Then the elevator
moves up 5 floors, down 3 floors, and up 2 floors. If you are then at
the 8th floor, on what floor did you first enter the elevator?
371+445=1036
137+544=?